<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>选择排序</title>
</head>

<body>
   <?php
      $arr=array('10','12','9','7','20');
         for($i=0,$len=count($arr);$i<$len;$i++){
             $min=$i;
         for($j=$i+1;$j<$len;$j++){
             if($aa[$j]<$arr[$min]){
                $min=$j;
             }
         }
             if($min!=$i){
                $temp=$arr[$i];
                $arr[$i]=$arr[$min];
                $arr[$min]=$temp;
             }
         }
      var_dump($arr);
   ?>

</body>
</html>